old installed builds in Mock chroot are not updated prior to running rpmlint on them

Description

As found during review request bug ​https://bugzilla.redhat.com/891282 , fedora-review runs rpmlint on past builds of a package installed in the Mock chroot instead of updating them with the latest builds. The review.txt report then contains rpmlint results for the old builds in the "Rpmlint (installed packages)" section.